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journal article·2024-11-05

Revealing Anion Exchange in Two-Dimensional Nanocrystals

Yalei Deng, Yaobo Li, Yuelin Yang, Xinke Kong, Dechang Zhang, Yu Deng, Zhen Meng, Zaiping Zeng, Yuanyuan Wang

ACS Nano· Volume 18· Issue 44
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Source abstract

Abstract

Ion exchange is a powerful postsynthesis tool for the design of functional nanomaterials. However, achieving anion exchange while maintaining the original morphology and crystal structure, as well as elucidating the mechanism, remains challenging. Here, we developed an anion-exchange strategy under mild conditions and revealed an unusual ion-exchange mechanism in the semiconductor nanoplatelets. Kinetic studies have demonstrated that the transformation follows first-order kinetics, with the ligand restricting the guest anion from diffusing only in one-dimensional directions. By monitoring the reaction process, we demonstrated that the anion exchange reaction occurs selectively on the polar surface of the NPLs and exhibits asymmetry at the two polar end faces. Theoretical simulations further confirmed that anion exchange began from the chalcogenide-dominated facet. The thermodynamic data suggest that guest ions diffuse into the crystal interior via a direct exchange mechanism. This study provides a pathway for anion exchange and the construction of functional nanocrystals and a platform for studying the optoelectronic behavior of single-sheet heterojunctions.
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Research context

NanomaterialsElectronic materials

OpenAlex topics: Quantum Dots Synthesis And Properties · X-ray Diffraction in Crystallography · Advanced Photocatalysis Techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Coordination Chemistry, National Laboratory of Solid State Microstructures, School of Chemistry and Chemical Engineering, College of Engineering and Applied Sciences

Nanjing University

Key Laboratory for Special Functional Materials of Ministry of Education, Collaborative Innovation Center of Nano Functional Materials and Applications, and School of Materials Science and Engineering

Henan University

Funding

National Key Research and Development Program of China · China Postdoctoral Science Foundation · National Natural Science Foundation of China · Henan University · Science and Technology Support Program of Jiangsu Province · Program for Innovative Talents and Entrepreneurs in Jiangsu · Training Program of Youth Backbone Teacher of Henan Province · Zijin Scholars Foundation · Key research and development program for international science and technology cooperation in Henan province

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